2.0.22

2.0.22 (2020-12-22)

Merged pull requests:

• Fix/#160 audit #161 (BalloonWen)
• fixes #158 make OpenApiHelper a singleton with an init method and loa… #159 (stevehu)
• issue-#156 #157 (BalloonWen)
• fixes #154 splite openapi-meta to move specification parser to openap… #155 (stevehu)
• issue-#152 #153 (BalloonWen)